Re-Used Props - Various
Objects

Many props and pieces of decoration in Star Trek were later modified or even
recycled without changes to represent items for a different purpose or of
another civilization. Here are quite a
few examples of objects such as musical instruments and tableware. Please note that every statement made here should be taken with a grain of salt.
There is no need to seek for explanations. Certainly we are not
supposed to watch closely enough to notice that the same items are used in distant corners of the galaxy.

Musical
Instruments

Small gong

The octagonal Betazoid gong, as visible and (too often!) audible in TNG:
"Haven" and "Manhunt", is essentially the same as the
Taresian gong in VOY: "Favorite Son". The round frame was removed
already prior to its second appearance in "Manhunt".

Big gong

Edo instruments

The transparent
lyre played by the Edo man on the left later appears on Aldea in "When the
Bough Breaks". The harp of the Edo man on the right later also shows up in
"When the Bough Breaks", where it is played by Katie in her quarters.
It seems to be based on Adam's guitar-like instrument in the TOS episode
"The Way to Eden".

Metallic tableware

The cups and pitcher used for the Klingon tea ceremony in TNG: "Up the
Long Ladder" reappear in the DS9 episode "The Ship". In that episode, the Vorta Kilana brings food and drink to Sisko using this tableware.

Drinking glass

The Edo in TNG: "Justice" use characteristic glasses with a transparent blue ball at the bottom. These glasses reappear in the DS9 episode "Fascination" as decorative glasses. Alsia drinks from a similar glass in
DS9: "Rivals".

Kivas Fajo's jar

Among
Kivas Fajo's treasures in TNG: "The Most Toys" there is also a
striped jar with a handle, perhaps a teapot or a vase. Curiously this jar can be
seen in Dr. Crusher's, O'Brien's and Worf's quarters in later TNG episodes. It is
visible in Data's shelf in TNG: "Genesis" and even on Troi's
table in ENT: "These Are The Voyages". Belated revenge? Anyhow, it
seems like an intentional running joke that the item is passed around among the
Enterprise crew, even 15 years after the original episode. The jar also appeared
on Voyager and on the K'mpec's Klingon attack cruiser in "Reunion".